Liquid analyzing apparatus

Abstract

In a liquid chromatographic analyzer apparatus, there is possibility that a flow cell is damaged when a flow passage is blocked and the inner pressure is increased. In order to prevent damage to the apparatus, liquid is prevented from leaking inside the apparatus. The liquid is discharged externally through a liquid discharging tube. A spring member is provided between the flow cell and the seal in a tube connecting portion to allow liquid to leak when the pressure is increased. Further, a light-proof tube for blocking light is connected to the flow cell to allow the leaked liquid to flow through the light-proof tube.

What is claimed is: 
     
       1. A liquid analyzing apparatus comprising: a liquid supplying passage;   a liquid discharging passage; and   a liquid flow passage formed by providing a liquid analyzing flow cell between said liquid supplying passage and said liquid discharging passage; wherein a pressure release port is provided in said liquid flow passage, said pressure release port squeezing out pressure exceeding a certain value of pressure outside said liquid supplying passage with the pressing force of the pressure when the pressure exceeding the certain value of pressure is applied to said flow cell, said liquid supplying passage or said liquid discharging passage.   
     
     
       2. A liquid analyzing apparatus comprising: a liquid supplying passage;   a liquid discharging passage; and   a liquid flow passage formed by providing a liquid analyzing flow cell between said liquid supplying passage and said liquid discharging passage; wherein a pressure release valve is provided in said liquid supplying passage or said liquid discharging passage, said pressure release valve being forced to open by the pressure of liquid when said liquid is supplied at a pressure exceeding a certain value of pressure, to said flow cell.   
     
     
       3. A liquid analyzing apparatus comprising: a liquid supplying passage;   a first liquid discharging passage; and   a liquid flow passage formed by providing a liquid analyzing flow cell between said liquid supplying passage and said first liquid discharging passage; wherein a pressure release port is provided between said liquid supplying passage and a second liquid discharging passage, said pressure release port discharging liquid outside said liquid supplying passage with the force of pressure when the liquid having a pressure exceeding the certain value of pressure is applied to said flow cell, said liquid supplying passage or said liquid discharging passage.   
     
     
       4. A liquid analyzing apparatus comprising: a liquid supplying passage;   a first liquid discharging passage; and   a liquid flow passage formed by providing a liquid analyzing flow cell between said liquid supplying passage and said first liquid discharging passage; wherein a pressure release port is provided between said liquid supplying passage and a second liquid discharging passage having a pressure lower than the pressure in said liquid flow passage, said pressure release port squeezing out pressure outside said liquid supplying passage with the force of pressure when a pressure exceeding a certain value of pressure is applied to said flow cell, said liquid supplying passage or said liquid discharging passage.   
     
     
       5. A liquid analyzing apparatus according claim 1, wherein said certain value of pressure is lower than a withstanding pressure of said liquid analyzing flow cell. 
     
     
       6. A liquid analyzing apparatus comprising: a liquid supplying passage;   a liquid discharging passage having a two-layer structure; and   a liquid flow passage formed by providing a liquid analyzing flow cell between said liquid supplying passage and said liquid discharging passage, wherein a pressure release port is provided in an inner layer of said liquid discharging passing having a two-layer structure, said pressure release port releasing pressure exceeding a certain value of pressure with the force of pressure when the pressure exceeding the certain value of pressure is applied to said flow cell, said liquid supplying passage or said liquid discharging passage.   
     
     
       7. A liquid analyzing apparatus comprising: a liquid supplying passage having a two-layer structure;   a liquid discharging passage; and   a liquid flow passage formed by providing a liquid analyzing flow cell between said liquid supplying passage and said liquid discharging passage; wherein a pressure release port is provided in an inner layer of said liquid supplying passage having the two-layer structure, said pressure release port releasing pressure exceeding a certain value of pressure with the force of pressure when the pressure exceeding the certain value of pressure is applied to said flow cell, said liquid supplying passage or said liquid discharging passage.   
     
     
       8. A liquid analyzing apparatus according to claim 6, wherein said certain value of pressure is lower than a withstanding pressure of said liquid analyzing flow cell. 
     
     
       9. A liquid analyzing apparatus comprising: a liquid supplying passage;   a liquid discharging passage having a two-layer structure; and   a liquid flow passage formed by providing a liquid analyzing flow cell between said liquid supplying passage and said liquid discharging passage;   wherein a portion between an end portion of an outer layer of said liquid discharging passage having the two-layer structure and said liquid analyzing flow cell are kept liquid-proof; and   a spring member being arranged fixed to said end portion of the outer layer such that the spring member pushes said end portion of the inner layer to said liquid analyzing flow cell.   
     
     
       10. A liquid analyzing apparatus comprising: a liquid supplying passage having a two-layer structure;   a liquid discharging passage;   a liquid flow passage formed by providing a liquid analyzing flow cell between said liquid supplying passage and said liquid discharging passage, wherein a portion between an end portion of an outer layer of said liquid supplying passage having the two-layer structure and said liquid analyzing flow cell are kept liquid-proof; and   a spring member being arranged fixed to said end portion of the outer layer such that the spring member pushes said end portion of the inner layer to said liquid analyzing flow cell.   
     
     
       11. A liquid analyzing apparatus comprising: a liquid supplying passage having a two-layer structure;   a liquid discharging passage having a two-layer structure;   a liquid flow passage formed by providing a liquid analyzing flow cell between said liquid supplying passage and said liquid discharging passage, wherein a portion between an end portion of an outer layer of said liquid supplying passage having the two-layer structure and said liquid analyzing flow cell are kept liquid-proof; and   a spring member being arranged fixed to said end portion of the outer layer such that the spring member pushes said end portion of the inner layer to said liquid analyzing flow cell.   
     
     
       12. A liquid analyzing apparatus according to claim 6 further including: a plurality of electrodes kept in an insulating state from one another are arranged between the inner layer and the outer layer of said liquid supplying passage having the two-layer structure or said liquid discharging passage having a two-layer structure and   means for measuring the resistivity between each electrodes provided in each of said plurality of electrodes.   
     
     
       13. A liquid analyzing apparatus having a liquid analyzing flow cell, comprising: a tube connecting mechanism having a seal mechanism using a spring member provided in a liquid outlet of a flow cell and/or a liquid inlet of a flow cell, liquid being discharged through said tube connecting mechanism when a pressure in the flow cell becomes above a pressure determined by said spring member.   
     
     
       14. A liquid analyzing apparatus according to claim 13, wherein a tube connected to said tube connecting mechanism has a double tube structure: liquid to be analyzed flowing in the inner tube and discharged liquid flowing at an elevated pressure between said inner tube and the outer tube. 
     
     
       15. A liquid analyzing apparatus according to claim 14, wherein the outer layer portion of said tube is made of a light-proof material.